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一、引言元素的周期系是周期律的表現形式。根据元素性质的周期性可以将元素排成各种各样的形式,这些不同的形式都叫做周期表。1871年門捷列夫以周期律为基础提出了反映元素内在联系的周期表,从此以后不断有人提出各种类型的周期表,到目前为止已經发表了170多种。最常見的是在平面上排列的周期表,也有一些用空間坐标排成的,根据
First, the introduction of elements of the periodic system is the manifestation of the periodic law. According to the cyclical nature of the elements of the elements can be arranged in a variety of forms, these different forms are called the periodic table. In 1971, Mendeleev proposed a periodic table based on the periodic law, which reflected the internal connection of the elements. Since then, various types of periodic tables have been proposed and more than 170 kinds of periodic tables have been published. The most common is the periodic table arranged in the plane, there are some with spatial coordinates arranged according to